01 - Cook pasta in a large pot of salted boiling water until al dente. Drain well and set aside.
02 - In a saucepan over medium heat, whisk together Dijon mustard, maple syrup, and heavy cream. Warm gently, stirring frequently. Once heated through, add shredded cheddar cheese and continue stirring until completely melted and the sauce is smooth. Season with salt and freshly ground black pepper to taste.
03 - In a large mixing bowl, combine the cooked pasta, cubed or shredded chicken, broccoli florets, and maple mustard sauce. Mix until evenly coated. Transfer mixture into a greased baking dish, spreading it into an even layer.
04 - In a small bowl, mix together panko breadcrumbs, melted butter, and grated Parmesan if desired. Sprinkle topping evenly over the pasta mixture in the baking dish.
05 - Bake in a preheated oven at 375°F (190°C) for 20 to 25 minutes, or until the top is golden brown and the filling is bubbling at the edges.